Auto-injector



FIG. 1 is a perspective view of an auto-injector embodying the principles of my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof.

FIG. 4 is a side view thereof, the opposite side being a mirror image thereof; and,

FIG. 5 is a top view thereof, the bottom view being a mirror image thereof. 

The ornamental design for an auto-injector, as shown and described. 